Casing



FIG. 1 is a perspective view of a casing showing a first embodiment ofmy new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a bottom plan view thereof.

FIG. 8 is a perspective view of a casing showing a second embodiment ofmy new design;

FIG. 9 is a top plan view thereof;

FIG. 10 is a left side view thereof;

FIG. 11 is a right side view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a front view thereof; and,

FIG. 14 is a bottom plan view thereof.

CLAIM The ornamental design for a casing, as shown and described.